JPS5965196A - Method and apparatus for earth drill bottom enlarging drill-ing, drilling bucket and bottom scrapping bucket - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bottom-expanding excavation method using an earth drill method (hereinafter referred to as the ED method), a device for carrying out this method, and a bird IJ bucket, tow, and bottom cleaning packet used in this method.

An earth drill is a deep hole excavator that excavates a depth of 80 to 40 meters from the surface of the earth until it reaches hard ground to support the weight of a building of 12 kilograms, pours concrete, and erects horizontal concrete supports.

In addition to the FD method, there are generally known reverse, circulation, and drill methods (hereinafter referred to as ROD methods) for drilling deep holes for such purposes.

This ROD method uses a large amount of water to flush out the excavated soil, making it difficult to process large amounts of slime by hand. The ED method, which excavates using a solution, stores the excavated soil in a drilling bucket, pulls it up, and then discharges it, is easy and widely used.

However, in the case of the ROD method, the muddy water is sucked up and discharged, so the bottom-expanding method as shown in Figure 18 can be easily carried out, and the withstand pressure of the concrete support can be increased. It was not possible to use the bottom widening method because it was difficult to raise the ground.

Since the bottom expansion method is extremely effective in increasing pressure resistance, the realization of the bottom expansion method using the ED method has been a long-held desire of the industry.

This invention has been researched and developed under the above circumstances, and will be explained below based on the drawings illustrating the embodiments.

A drilling package (3) having a drilling blade 09 on the bottom is attached to the tip of the Kelly bar (2) suspended on the earth drill machine (1) shown in Fig. A drilling bucket is used in the earth drill excavation method to drill a deep hole (←) as shown in the figure.

At three locations on the outer periphery of the hole (3), expanded bottom anisotropy Ql for performing approximately conical drilling with a downwardly expanded bottom is extended outwardly from the drilling bucket main body a1 using hydraulic pressure, and the bottom of the drilling hole is approximately expanded. After drilling to expand the bottom in a conical shape, retract the bottom expansion anisotropic drill and pull it out from the deep hole, and place it in the drilling bucket (3
) Instead, a bottom cleaning packet (4) with a scraping window on the bottom is attached to the tip of the Kelly bar (2) and inserted into the deepening bottom, and the circumference below the cylindrical outer peripheral wall of this bottom cleaning packet (4) is attached to the tip of the Kelly bar (2). By hydraulically opening and rotating the opening doors (c) installed at the two locations in a door-like manner, the expanded bottom part (
This method completes the bottom expansion excavation by sweeping the remaining soil from 61) into a cylinder, closing the flushing door (E), and pulling it out.

As a final device ffj for carrying out this bottom-expanding excavation method,
Said drilling package? ) (3) and the bottom cleaning packet (4) are installed on the main body of the earth drifting machine (1), and installed on the bottom side of the drive head (6) for the Kelly bar (2). Two fit inside and outside, placed in
Outer cylinder (7a) of rotary joint (7) consisting of a cylinder
is fixed, a circuit to the hydraulic unit (5) is connected to the outer periphery, and the inner cylinder (2) rotates integrally with one Kelly bar (2).
7b) at the lower end, as shown in Figures 2 and 8.
The hose reels (8) (8a) are mounted on the bracket (9), and the hose reels (8) (8a) are mounted on the bracket (9).
8a) is chain driven by hydraulic motor 0[j (10a), torque limiter 0I)(lla), reducer 0→
(12a). And of this Td'i
(7b) has a circuit to the drilling bucket (3) or bottom cleaning bucket, )(4), and the hose reel (8) (8a
)'9, and a circuit to the hydraulic motor % (10a) for the hose reel is also connected to connect the fixed hydraulic unit (5) to the rotating drilling bucket (
3) or the bottom cleaning bucket, 4j and 7 are constructed so that the hydraulic circuit to (4) is connected.

Next, Fig. 4 shows an example of the rotary joint (7).

This will be explained based on FIGS. 5 and 6.

The outer cylinder (7a) is attached and fixed to the drive head (6).
) on the outer periphery of the main circuit Huυ connected to the hydraulic unit (5) by changing the position 1t1 in the vertical direction, the hose reel drive circuit (ψ), and the hydraulic unit to remove leakage oil from the rotary joint (7). ) The train circuit ■ returning to the oil tank θ1 in (5) is connected, and there are circumferential grooves (30a) (31a) (32a) (33a) (
34a), and inner cylinder oil passages (30'b) (31
b) (32b) (33b) are provided at hidden positions in the circumferential direction of the inner cylinder, and these internal oil passages communicate with the outer periphery near the lower end of the inner cylinder to connect the hose reels (8) and (8a). Drilling bucket (3) or bottoming packet (
4) Main circuit (to) 0υ and hose reel (8) (
A hose reel drive circuit Cta <<φ is connected to the hydraulic motor QO (10a) that drives the motor 8a).

Next, an example of the hydraulic system that controls the operation of this device will be explained based on FIG. 7.

2 points KJ The hydraulic unit surrounded by the line) (5) has an oil tank θ0. Strainer θυ, hydraulic pump θ→, driving force (whisper @ 葎).

-Next leaf valve Kyu, -Next pressure gauge (F), check valve θe, secondary leaf valve θ, secondary pressure gauge main circuit switching valve θS, hose reel drive switching valve &).

An emergency switching valve φυ is incorporated, and the - next pressure is 140Kg/
d, set the secondary pressure to 70 Kq/ctl, respectively, and connect to the main circuit) υ and hose reel drive circuit C1.
(9 is the secondary pressure, and the emergency circuit is configured to work directly with the secondary pressure.

This main circuit OIO is connected to the rotary joint (7).
) is connected to the drilling bucket (3) or the bottom cleaning bucket, ) (4) via the hose reel (8)' (8 &), and the hose reel drive circuit ζI→ku→ is connected to the rotary joint (7). ) to the hose reel (8)
(8a) is connected to a hydraulic motor (J(j(10a)).

Furthermore, the emergency safety circuit COG CVD is used to reconnect the main circuit ←)ζzuυ as shown by the dashed line in the event of an accident such as a stone getting caught in the drilling bucket) C () or the bottom cleaning packet (4). These circuits are connected between the hydraulic unit (5) and the rotary cylinder (7) and between the hydraulic unit (5) and the rotary cylinder (7) to facilitate connection changes.
4-Tally joint (7) and drilling bucket.

Six coupling joints that can be attached and detached with one touch are provided between the bottom cleaning buckets 2 and 4 and between the hydraulic motor OO (10a).

Drilling bucket, ) (3) or bottom cleaning packet (4)
) is the main cylinder 6 which controls the insertion and removal of the expansion wing blade 0 * and the opening and closing of the rear door (to), and the reciprocating movement of this main cylinder controls the insertion and removal of the expansion blade blade 0* or the rear door cover. Open confirmation switching valve 6 to confirm opening/closing
; All and m confirmation switching valve 0 is built in along with the check and k valves ←υEl across the main circuit (g) 0υ, and an emergency cylinder G to open the bottom θ or bottom (jl) in case of an emergency. An emergency relief valve G→ for the emergency cylinder is provided branching off from the main circuit 1, and this emergency relief valve 6 is equipped with a bypass valve 61 with a valve 61 for emergency relief. This allows the return from the 6 cylinders to pass through without resistance.

Next, the drilling bucket (3) and bottom stripping packet (4)
).

As shown in FIGS. 8 to 12, the drilling bucket yN3) has a bottom hinge (14a) with an inverted umbrella-shaped bottom θ on the lower end surface of the cylindrical drilling packet body 01.
An opening/closing rod OQ that is attached so as to be openable and closable and locks it vertically passes through the drilling bucket body 01, and has a handle (15a) at the upper end protrusion and a hook (15b) at the lower end.
This latch claw (15b) hooks and locks on the bottom θa, and digging blades OQ are attached at eight locations on the umbrella-shaped lower surface of the bottom to scoop the excavated earth and sand into the drilling bucket body θ1. In addition to the same structure as the conventional one, which has a transparent window Q for scooping and a closing plate 0 seconds to prevent the scooped earth and sand from leaking, there are I (A wide-bottom blade θ1 that is long and wide at the lower end is attached to the drilling bucket body o0 at its upper end by a blade hinge (19a), and a cutting blade (191) extending vertically on its outer edge side) is attached to three wide-bottom blades θ1 with a wide bottom end. Change the blades by about 1a each? If it is provided so that a smooth excavation surface can be obtained, and the downward lot end of the main cylinder 6 diamond arranged vertically in the center of the main body and the expanded bottom blade blade θ
The wing blade arm is connected near the center of the inner side by ),
When drilling a straight deepening, use a drilling package,
When the bottom of the deep hole is to be enlarged, the main cylinder 6→ is operated and the blade OI is placed in the upper end of the hole to enlarge the bottom x, as shown by the two-dot chain line in Fig. 9. 3-blade hinge (
19a) is in the center and widens towards the end so that it can be stretched outside the cylinder.

In addition, as shown in the hydraulic circuit diagram in Fig. 7, the expanded bottom blade blade 01
The hydraulic circuit is mechanically switched using the opening/closing movement of the main cylinder 6, the movement of the opening of the main cylinder, the movement of the opening of the main cylinder, and the movement of other appropriate places. A switching valve 64j is installed to check the movement of the enlarged bottom B blade θ by changes in the flow of the hydraulic circuit, and to prevent abnormalities such as stones etc. being caught in the enlarged bottom blade θ1 during cutting. In such a case, operate the emergency cylinder 6''I) to rotate the opening/closing body θυ, unlock the bottom a →, and move the bottom α as shown by the two-dot chain line in Figure 8. The abnormality is resolved by opening → and dropping the dirt inside the drilling bucket body θ; QI) is the Kelly bar mounting box.

As shown in Figures 13 to 17, the bottom cleaning bucket (yl) has almost the same structure as the drilling bucket, with an opposite umbrella shape on the lower end surface of the bottom cleaning packet body (a). The bottom hinge (23a)
It is attached so that it can be opened and closed, and it can be opened and closed by opening and closing.
Q4 vertically passes through the main body of the bottom cleaning packet), the upper end is used as a handle (24a), and the lower end is provided with a hook (24b).
The latch claw (241)) hooks onto the bottom (2), and the bottom has two protruding edges (A) on the umbrella-shaped lower surface of the bottom. Scratched window adjacent to the edge &f
) and a blocking board to prevent the soil from falling. The bottom of the packet body (
A door-like opening door (A) attached to the opening door (A) is provided, and this opening door @ connects the downward lot end of the main cylinder 6o, which is arranged vertically at the center of the main body, and the inside of the opening door (C). The deep hole (by operating the six main cylinders at the enlarged bottom part (61) of the rabbit arm and opening the door as shown in Fig. 15) opens into a door shape with the door hinge (28a) as the center. It opens outward.

Also, as an emergency safety device shown in the hydraulic circuit diagram in Figure 7, the open/close switch valve ←) is closed? The series of emergency safety devices related to the i/fi introduction switching valve ←◆, check, and Kupulp) and (→, 6 emergency cylinders, relief valve trowel, and check valve operator) are the same as those for the drilling bucket.However, This series of emergency safety devices may be omitted in the case of a bottom-clearing packet, since accidents such as the bottom-clearing door not being able to move during work almost never occur.

Qυ is the Kelly bar mounting box as in the case of the drilling bucket (3).

This invention is based on the above configuration, and first, the drilling bucket (3) is placed at the tip of the Kelly bar (2) in the state shown in FIG.
) is removed with the expanded bottom wing blade OI housed in the drilling bucket body 01, and when it is rotated and lowered by the drive head (6), the drilling blade θQ on the bottom surface of the bottom 04) is removed.
However, drilling is carried out using bentonite solution as the drilling fluid. The excavated soil is stored in the drilling bucket main body θ by pushing up the closing plate θ frame from the scoop transparent window 0 as shown by the two-dot chain line in Figure 12, and when the bucket is full, it is pulled out. The closing plate ([0] is the pressure of the stored earth and sand, as shown by the solid line in Figure 12, which closes the transparent window O to prevent it from leaking.

The pulled up drilling bucket (3) is attached to the top handle (1).
5a) by hand, and rotate the latch claw (15) at the lower end of the opening/closing body θ9.
When b) is removed from the hooking part of the bottom αΦ, the bottom αa turns and falls as shown by the arrow around the bottom hinge (14a) as shown by the line #2 in Figure 8, and falls inside the drilling bucket body O; of earth and sand will be discharged.

Next, close the bottom θ→ and excavate around the edges in the same way, usually about 30 to 40 meters until you reach hard ground. Up to this point, the process is the same as the conventional ED method, but in order to subsequently perform bottom-expanding excavation, the drilling bucket (3) is at the bottom of the deep hole, and when the main circuit switching valve θ (center) is switched, the hydraulic unit (5-channel The flow flows from the rotary joint (7) to the main circuit (2), passes through the hose reel (8), lowers the main cylinder ←, and the blade arm (E) moves the expanded blade blade θ, as shown in Figure 9. As shown by the dotted chain line, the cutting blade (lc+b) provided vertically on the outer end side of the bottom-expanding wing blade θ9 expands and excavates the peripheral wall of the bottom of the deep hole because it protrudes outside the drilling bucket body 01. When the expanded bottom blade blade α is fully opened, the movement of the six main cylinder openings and openings at that time is mechanically detected and the opening/closing switching valve 6 is configured to switch. , Main cylinder 60
While operating, return to the main circuit 0υ through the check valve).

In this way, the main circuit (1l) 6υ is constantly flowing during operation, and the pressure required for excavation (usually about 80 Kg / cTJ)
The secondary pressure gauge @ Camphor indicates that it is operating at 16
By edicting, it is possible to know that the expanded bottom wing blade θ1◆ is protruding normally.

However, in this case, an emergency relief valve set to 80Kq/cJ, which is higher than the set pressure cuff 0Kq/c4 of the secondary relief pulp 071, is interposed in the circuit to the emergency cylinder connected to the main circuit 0υ. Therefore, under normal conditions, this emergency cylinder 6''I) does not operate and is irrelevant.

If the bottom expansion L (blade 01 is jammed with a stone or the like and cannot be inserted halfway), the load on the hydraulic pressure will be maximum, so the secondary pressure gauge θ frame should be adjusted to the secondary relief valve θη. By specifying the set pressure cuff 0 Kg/crJ, this will allow you to know when an abnormal situation has occurred.

Further, in this state, the noise of the hydraulic unit (5) becomes louder, so that small abnormal parts can be detected by hearing.

If such an abnormal situation occurs, as shown by the one-dot chain line in Fig. 7, disconnect the connection of the main circuit switching valve (starting from the main circuit) to the main circuit
It is changed to υ. In this way, the main circuit (G) 0
0 is the primary leaf valve θ → set pressure 140 kg
/ c! As a result, the above-mentioned emergency relief pulp (a) is passed through and the emergency cylinder (b) is operated, and this emergency cylinder l1i7) acts on the opening/closing rod 0υ in the drilling bucket (3) and opens it. The latch claw (15b) at the lower end releases the opening of the bottom 0 barrel, and the bottom 0 barrel opens as shown by the two-dot chain line in Figure 8, and the drilling bucket (3) The expanded bottom blade θ1 can be drawn into the drilling bucket main body 03 by dropping the soil and removing debris such as stones caught in the expanded bottom blade OI.

When the cause of the abnormality is removed in this way, ρ in the main circuit (2) returns to normal flow, so if no excavation load is applied, the pressure will drop to near atmospheric pressure, and the emergency cylinder G will not self-reset. However, the return circuit at this time passes through a bypass circuit with a check valve 61 provided in the emergency relief valve (G).

Thereafter, the main circuit (O1) is returned to the original main circuit switching valve θ, the normal state is restored, and the work continues.

When the bottom-expanding excavation is completed, the main circuit switching valve (L4!) is switched to reverse the flow and return to the main circuit (from υ to main circuit 0), and the openings of the six main cylinders are pulled up.
The wide-blade arm body) pulls the expanded-bottom 8-blade blade (II) into the drilling bucket body 0. At this time, the expanded-bottom blade 0
When the σ1 of 1 is completed, the close switching valve 61 is switched due to the movement of the main cylinder ← the main cylinder, so the main circuit C1υ is opened to the valve and returned to the main circuit side). Thus, it can be seen that the 8-blade 8-blade 0-blade has been reliably drawn into the drilling bucket body 01.

In this way, after retracting the expanded wing blade 01, the Kelly bar (
If 2) is raised by σ1, the bottom expansion excavation will be completed.

When the bottom-expanding excavation is completed, there is some residual soil in the bottom-expanding section (61).
Attach the bottom cleaning packet (4) instead of the drilling bucket (3) to the tip of the bottom opening, and with the opening door closed (1), insert the expanded bottom section (60) and turn on the main circuit switching valve IQ.
Then, the expanded base blade O in the case of drilling bucket (3)
In the same way as extending I, open the opening door (A) outward as shown in Figure 15. When it rotates in this way, the thin edge (c) scrapes the remaining soil on the bottom of the bottom 0 and creates a scraping window.
As shown by the two-dot chain line in Figure 14, the closing plate Q7) is pushed up and scraped into the bottom cleaning packet body (a), and at the same time, the remaining soil in the expanded area is removed by the cleaning door (c) and the bottom cleaning packet body is removed. (a) After loading the inside, switch the main circuit switching valve θf, close the opening door), and close the Kelly bar (
When it is pulled up together with 2), the closing plate 2) is pulled up by the pressure of the stored earth and sand, as in the case of the drilling bucket (3).
As shown by the solid line in Fig. 7, the scraping window (c) is blocked to prevent leakage.

Next, pull up the bottom cleaning bucket (4) and manually lower it to the bottom in the same way as the drilling bucket (3).
Open it as shown by the two-dot chain line in Figure 14 and discharge the dirt inside.

If the bottom of the soil cannot be cleared in one go, the same process is repeated several times until there is no remaining soil left.

Opening and closing of the Sarae door (c) W + ¥! In the event of an abnormality, the emergency cylinder 67) can be activated to open the bottom hole and resolve the abnormality, or the drilling bucket (3
), so the explanation will be omitted here to avoid duplication.

However, as mentioned before, this emergency safety device may be omitted because abnormalities such as stones getting stuck in the bottom-sweeping packet (4) rarely occur in the bottom-sweeping packet (4).

More drilling bucket? )(3) and bottom cleaning bucket 7
) (4) When lowering or raising the hydraulic hose while rotating with it attached, installing the four-tally joint (7) can prevent the hydraulic hose from becoming tangled and lowering or raising the hose while rotating. Each time, switch the hose reel drive switching valve ←) and switch the hydraulic motor Ot3.
(10a) is rotated in the forward or reverse direction, and this rotation is passed through the torque limiter 01) (ll&) to the hose reel (8) (8
(a), the hydraulic hose does not slacken or become too tense, and can easily adapt to descents and ascents.

When the bottom cleaning is completed, the excavation of the bottom enlarged deep hole is completed as shown in FIG. 18. After this, cage-shaped reinforcing bars are inserted and concrete is poured to complete the desired support.

As described above, the present invention uses the ED method, which was previously impossible, to implement the bottom widening method very easily without causing major losses like the ROD method, making it truly economical and bringing great news to the construction industry. This is an epoch-making result.

[Brief explanation of drawings]

The attached drawings show one embodiment of the present invention, and FIG. 1 is a partially cutaway side view showing the entirety of the earth drilling machine of the present invention, and FIG.
The figure is a side view showing the rotary joint and the hose reel part, Figure 3 is a plan view of Figure 2, Figure 4 is a vertical cross-sectional view of the rotary joint, and Figure 5 is a cross-sectional view taken along line A-A' in Figure 4. ,
Figure 6 is a sectional view taken along the line B-B' in Figure 4, Figure 7 is a hydraulic circuit diagram, Figure 8 is a front view of the drilling bucket with the expanded bottom blade extended, and Figure 9 is Figure 8a. A diagram showing only the main parts at the -O line cross section I'll, Figure 1O is the same as Figure 8.
The plan view seen from the direction of the arrow, Figure 11, is the same as Figure 8.
'Bottom view seen from the direction of the arrow, Figure 12 is Figure 11D-
D' enlarged sectional view, Figure 18 is the bottom cleaning bucket. Fig. 14 is a front view showing a state in which the bottom pick-up packet has closed the pick-up door; Fig. 15UA is a plan view of Fig. 13 viewed from the direction of arrow E; FIG. 16 is a bottom view of FIG. 13 seen from the direction of arrow l, FIG. 17 is an enlarged sectional view taken along line F-F' in FIG. 1. Earth drill [2. Kelly bar 3. Drilling bucket 4. Bottom cleaning packet 5. Hydraulic unit) 6. Drive head 7. 4-tally joint 7a.. Outer Hrb.- Outer cylinder 8. 8a...Hose reel 9...Bracket 10, 10a-Low oil pressure motor
11, 11a...Torque limiter 12.12a...Reducer 13...Drilling bucket body 14...Bottom
14a...Bottom hinge 15...Opening/closing rod 15a...
Handle 15b... Latching claw 16... Excavation blade 17... Rake window 18... Closing plate 19... Expanded Ω blade 19a
... Wing blade hinge 19b ... Cutting blade 20 ... No. J blade arm 21 ... Kelly bar mounting box 22 ... Bottom cleaning bucket body 23 ... Bottom 23a ... Bottom hinge 24 ... Opening/closing rod 24 & ... Handle 24b.・Latching claw 25・・Thin edge 26・・Screening window 27・・Closing plate 2
8...Drawing door 28a...Door hinge 29...Door arm 30.31...Main circuit 32.33...Hose reel drive circuit 34...Tren circuit 30a, 31a, 3
2a, 33a, 34a...peripheral groove 30b, 31
b. 32b, 33b...Inner cylinder oil path 35.36...Emergency safety circuit 37...Couple joint 38...Main circuit joint 39...Emergency circuit joint 40...Oil tank 41...Strainer 42...Hydraulic pump 43
・・Motor 44・・−Next relief pulp 45・・−
Secondary pressure gauge 46...Check pulp 47...Secondary relief valve 48...Secondary pressure gauge 49...Main circuit switching valve 50...Hose reel drive switching valve 51...Emergency switching valve 52...Main cylinder 53... Open confirmation switching valve
54...Closing confirmation switching valve 55.56...Check, check valve 57...Emergency cylinder 58...Emergency lily -7
Valve 59... Check 57 Rev 60... Deep hole 6
1. Expanded bottom part. (1 other person) Figure 1 Figure 9 Figure 3 Figure 4 □ Figure 5 Figure 6 Figure 7 Figure 9 Figure 8 Figure 10 Figure 11 Document (method) 1 Indication of matter A11 Patent Application No. 67567 of 1982 2.19Jvv
Name Earth Drill Bottom Expansion Excavation Method and its Equipment, Drilling Bucket t and Bottom Ramp Packet 3 Person Making Amendment (Relationship with 'l 4, Agent 1', 1 Dong, ,T-,,,-7TO
As shown in Attachment 8, in the name of the invention in the specification of the contents of the amendment, "equipment 4, drilling bucket TC, and bottom cleaning packet" for the earth drill bottom-expanding excavation method, and t and ru are replaced with "Earth drill bottom-expanding excavation method". and its 'dJi li'? and the drilling bucket and the bottom bounce,'' H1 corrects. I Jni

Claims (1)

[Claims] ■ In the earth drill drilling method in which a cylindrical drilling bucket is attached to the tip of a Kelly bar to drill a deep hole, a bottom-expanding cylindrical blade for performing bottom-expanding excavation at multiple locations around the outer circumference of the drilling bucket is installed using hydraulic pressure. After drilling the bottom of the deep hole by extending it outward from the cylinder, a bottom-sweeping packet is installed, which is equipped with a stripping door that opens and closes outward in the shape of a door, at multiple points around the circumference below the outer circumferential wall of the cylinder. An earth drill bottom expansion excavation method characterized by attaching it to the tip of a kelly bar instead of a drilling bucket to expose the remaining soil at the bottom expansion part. ■ Multiple pieces on the outer periphery of a cylindrical drilling bucket that is attached to the tip of a Kelly bar to drill a deep hole with an expanded bottom.
A bottom expanding steam blade that can be put in and taken out by hydraulic pressure is installed, and instead of a drilling bucket, it is attached to the tip of a kelly bar to clean the remaining soil in the expanded bottom part. Install a door that opens and closes like a door, and incorporate a confirmation device that mechanically detects whether the operation of the wide-bottomed island blade or, if necessary, the operation of the door is normal or abnormal and confirms this by switching the hydraulic circuit. At the same time, the bottom of the drilling bucket or the bottom of the bottom cleaning packet if necessary in case of an abnormality?
Equipped with an emergency safety device 1 that opens and closes with II+ pressure, a hydraulic unit for operating these devices is installed in the earth drill machine body, and a hydraulic unit is installed in the main body of the earth drill machine. A rotary joint is provided, and one of the inner and outer cylinders is used as the fixed side to connect the circuit from the hydraulic unit, and the other side is used as the rotating side that rotates in conjunction with the Kelly bar to connect the circuit to the drilling bucket or bottom cleaning packet. An earth drill bottom expansion drilling device characterized by being connected and equipped with a hose reel for a hydraulic hose. ■ A cylindrical triling tool that is attached to the tip of a Kelly bar and excavates while rotating. As a result of this action, the outer cutting blades protrude widely towards the bottom end, and when rotated, the outer cutting blades draw a nearly conical shape, and the opening and closing movements of the three blades are applied to this widening at the mouth of the main cylinder, etc., and other suitable locations. A confirmation switching valve is installed to switch the hydraulic circuit, and the flow of the hydraulic circuit is used to open and close the expanded bottom blade (Mfi).If an abnormality occurs in opening/closing, an emergency cylinder is activated to close the bottom. Drilling package for earth drill bottom-expanding excavation, which is characterized by its ability to open. ■ A cylindrical bottom-leveling package that can be attached to the tip of a Kelly bar to remove remaining soil at the bottom of the bottom-expanding section drilled with a kerato. The method is characterized in that a door-like opening and closing door is provided at several locations below the outer periphery of the packet, and the door is opened outward by a cylinder to expose the remaining soil.
"Earth Drill for Bottom Expansion Drilling" Packet.